1. The amount of electricity used: This is measured in kilowatt-hours (kWh). The more appliances you use and the longer you use them, the higher your kWh usage will be.

2. The price per kilowatt-hour: This is set by your electricity provider and can vary depending on your location, time of day, and the type of plan you have.

So, your total electric bill is calculated by multiplying your kWh usage by the price per kWh.